Colton O'Neil

Colton O'Neil was the twin brother of Hunter Radley, younger half-brother of Amanda O'Neil, and the son of the late Barry O'Neil and the late Samantha Radley. Growing up with his father and older sister, Colton became the vigilante known as Arsenal, a mantle later taken by his brother. However, he was supposedly killed by Deathshot.

However, it was revealed that he was not killed and had been loyal to the Highest Institute of Villainous Education all along, under the name Prometheus and confronted Hunter. Quickly gaining the upper hand, he was distracted with his story on how he was secretly a member of the H.I.V.E. and Hunter was forced to kill him, much to his distress.